Investigation Free Fall

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1 Investigation Free Fall Name Period Date You will need: a motion sensor, a small pillow or other soft object What function models the height of an object falling due to the force of gravit? Use a motion sensor to collect data, and analze the data to find a function. Step 1 Follow the Procedure Note to collect data for a falling object. Let represent time in seconds, and let represent height in meters. Select about 10 points from the free-fall portion of our data, with -values forming an arithmetic sequence. Record this information in the table. Round all heights to the nearest Time (s) Height (m) 1. Set the sensor to collect distance data approimatel ever 0.05 s for 2 to 5 s. [ See Calculator Note 7A to learn how to set up our calculator. ] 2. Place the sensor on the floor. Hold a small pillow at a height of about 2 m, directl above the sensor. 3. Start the sensor and drop the pillow. Step 2 Use the finite differences method to find the degree of the polnomial function that models our data. Stop when the differences are nearl constant. Discovering Advanced Algebra Investigation Worksheets LESSON

2 Investigation Free Fall (continued) Step 3 Create scatter plots of the original data (time, height), then a scatter plot of (time, first difference), and finall a scatter plot of (time, second difference). [ See Calculator Note 7B to learn how to calculate finite differences and how to graph them. ] Height First difference Time Time Second difference Time Step 4 Write a description of each graph from Step 3 and what these graphs tell ou about the data. 116 LESSON 7.1 Discovering Advanced Algebra Investigation Worksheets

3 Investigation Free Fall (continued) Step 5 Based on our results from using finite differences, what is the degree of the polnomial function that models free fall? Write the general form of this polnomial function. Step 6 Follow the eample on page 380 to write a sstem of three equations in three variables for our data. Solve our sstem to find an equation to model the position of a free-falling object dropped from a height of 2 m. Discovering Advanced Algebra Investigation Worksheets LESSON DAA2IW_ indd 117 1/9/09 3:43:27 PM

4 Investigation Free Fall With Sample Data Name Period Date What function models the height of an object falling due to the force of gravit? You will use data collected b a motion sensor and analze the data to find a function. Step 1 Following the Procedure Note, a motion sensor was used to collect data for a falling object. The heights were rounded to the nearest m and recorded in the table below. represents the falling time in seconds, and represents the object s height above the sensor in meters. Time (s) Height (m) Set the sensor to collect distance data approimatel ever 0.05 s for 2 to 5 s. [ See Calculator Note 7A to learn how to set up our calculator. ] 2. Place the sensor on the floor. Hold a small pillow at a height of about 2 m, directl above the sensor. 3. Start the sensor and drop the pillow Step 2 Use the finite differences method to find the degree of the polnomial function that models the data. Stop when the differences are nearl constant. 118 LESSON 7.1 Discovering Advanced Algebra Investigation Worksheets

5 Investigation Free Fall (continued) With Sample Data Step 3 Create scatter plots of the original data (time, height), then a scatter plot of (time, first difference), and finall a scatter plot of (time, second difference). [ See Calculator Note 7B to learn how to calculate finite differences and how to graph them. ] Height First difference Time Time Second difference Time Step 4 Write a description of each graph from Step 3 and what these graphs tell ou about the data. Discovering Advanced Algebra Investigation Worksheets LESSON

6 Investigation Free Fall (continued) Step 5 Based on our results from using finite differences, what is the degree of the polnomial function that models free fall? Write the general form of this polnomial function. Step 6 Follow the eample on page 380 to write a sstem of three equations in three variables for the data. Solve our sstem to find an equation to model the position of a free-falling object dropped from a height of 2 m. 120 LESSON 7.1 With Sample Data Discovering Advanced Algebra Investigation Worksheets DAA2IW_ indd 120 1/9/09 3:43:29 PM

7 Investigation Rolling Along Name Period Date You will need: a motion sensor, an empt coffee can, a long table Step 1 Step 2 Step 3 Step 4 Practice rolling the can up the table directl in front of the motion sensor. Start the can behind the starting line. Give the can a gentle push so that it rolls up the table on its own momentum, stops near the end of the table, and then rolls back. Stop the can after it crosses the line and before it hits the motion sensor. Set up our calculator to collect data for 6 seconds. [ See Calculator Note 7C. ] When the sensor begins, roll the can up the table. The data collected b the sensor will have the form (time, distance). Adjust for the position of the starting line b subtracting 0.5 from each value in the distance list. Let represent time in seconds, and let represent distance from the line in meters. Draw a graph of our data below. What shape is the graph of the data points? What tpe of function would model the data? Use finite differences to justif our answer. Prop up one end of the table slightl. Place the motion sensor at the low end of the table and aim it toward the high end. With tape or chalk, mark a starting line 0.5 m from the sensor on the table. Distance (m) Time (sec) Discovering Advanced Algebra Investigation Worksheets LESSON

8 Investigation Rolling Along (continued) Step 5 Mark the verte and another point on our graph. Approimate the coordinates of these points and use them to write the equation of a quadratic model in verte form. Step 6 From our data, find the distance of the can at 1, 3, and 5 seconds. Use these three data points to find a quadratic model in general form. Step 7 Mark the -intercepts on our graph. Approimate the values of these -intercepts. Use the zeros and the value of a from Step 5 to find a quadratic model in factored form. Step 8 Verif b graphing that the three equations in Steps 5, 6, and 7 are equivalent, or nearl so. Write a few sentences eplaining when ou would use each of the three forms to find a quadratic model to fit parabolic data. 122 LESSON 7.2 Discovering Advanced Algebra Investigation Worksheets

9 Investigation Rolling Along With Sample Data Name Period Date Step 1 Following the Procedure Note, a can was placed directl in front of a motion sensor and behind the starting line. The can was gentl pushed so that it rolled up the table on its own momentum, stopped near the end of the table, and then rolled back. Prop up one end of the table slightl. Place the motion sensor at the low end of the table and aim it toward the high end. With tape or chalk, mark a starting line 0.5 m from the sensor on the table. Step 2 A calculator was set to collect data for 6 seconds. When the sensor began, the can was rolled up the table. Discovering Advanced Algebra Investigation Worksheets LESSON

10 Investigation Rolling Along (continued) With Sample Data Step 3 The data collected b the sensor had the form (time, distance). The distance was adjusted for the position of the starting line b subtracting 0.5 from each value in the distance list before recording it in this table. Time (s) Distance from line (m) Time (s) Distance from line (m) Step 4 Let represent time in seconds, and let represent distance from the line in meters. Draw a graph of the data. What shape is the graph of the data points? What tpe of function would model the data? Use finite differences to justif our answer. Distance (m) Time (sec) 124 LESSON 7.2 Discovering Advanced Algebra Investigation Worksheets

11 Investigation Rolling Along (continued) With Sample Data Step 5 Mark the verte and another point on our graph. Approimate the coordinates of these points and use them to write the equation of a quadratic model in verte form. Step 6 From the data, find the distance of the can at 1, 3, and 5 seconds. Use these three data points to find a quadratic model in general form. Step 7 Mark the -intercepts on our graph. Approimate the values of these -intercepts. Use the zeros and the value of a from Step 5 to find a quadratic model in factored form. Step 8 Verif b graphing that the three equations in Steps 5, 6, and 7 are equivalent, or nearl so. Write a few sentences eplaining when ou would use each of the three forms to find a quadratic model to fit parabolic data. Discovering Advanced Algebra Investigation Worksheets LESSON

12 Investigation Complete the Square Name Period Date You can use rectangle diagrams to help convert quadratic functions to other equivalent forms. Step 1 a. Complete a rectangle diagram to find the product ( 5)( 5), which can be written ( 5) 2. Write out the four-term polnomial, and then combine an like terms ou see and epress our answer as a trinomial. b. What binomial epression is being squared, and what is the perfect-square trinomial represented in this rectangle diagram? c. Use a rectangle diagram to show the binomial factors for the perfect-square trinomial LESSON 7.3 Discovering Advanced Algebra Investigation Worksheets

13 Investigation Complete the Square (continued) d. Find the perfect-square trinomial equivalent to (a b) 2???. Describe how ou can find the first, second, and third terms of the perfect-square trinomial (written in general form) when squaring a binomial. Step 2 Consider the epression 2 6. a. What could ou add to the epression to make it a perfect square? That is, what must ou add to complete this rectangle diagram? b. If ou add a number to an epression, then ou must also subtract the same number in order to preserve the value of the original epression. Fill in the blanks to rewrite 2 6 as the difference between a perfect square and a number ( 3) 2 c. Use a graph or table to verif that our epression in the form ( h) 2 k is equivalent to the original epression, Step 3 Consider the epression a. Focus on the 2nd- and 1st-degree terms of the epression, 2 6. What must be added to and subtracted from these terms to complete a perfect square et preserve the value of the epression? Discovering Advanced Algebra Investigation Worksheets LESSON

14 Investigation Complete the Square (continued) b. Rewrite the epression in the form ( h) 2 k. c. Use a graph or table to verif that our epression is equivalent to the original epression, Step 4 Rewrite each epression in the form ( h) 2 k. If ou use a rectangle diagram, focus on the 2nd- and 1st-degree terms first. Verif that our epression is equivalent to the original epression. a b. 2 b 10 When the 2nd-degree term has a coefficient, ou can first factor it out of the 2nd- and 1st-degree terms. For eample, can be written 3( 2 8) 5. Completing a diagram for 2 8 can help ou rewrite the epression in the form a( h) 2 k Original epression. 3( 2 8) 5 Factor the 2nd- and 1st-degree terms. 3( ) 3(16) 5 Complete the square. You add 3 16, so ou must subtract ( 4) 2 43 An equivalent epression in the form a( h ) 2 k LESSON 7.3 Discovering Advanced Algebra Investigation Worksheets

15 Investigation Complete the Square (continued) Step 5 Rewrite each epression in the form a( h) 2 k. For Step 5a, use a graph or table to verif that our epression is equivalent to the original epression. a b. a Step 6 If ou graph the quadratic function a 2 b c, what will be the -coordinate of the verte in terms of a, b, and c? How can ou use this value and the equation to find the -coordinate? Discovering Advanced Algebra Investigation Worksheets LESSON

16 Investigation How High Can You Go? Name Period Date Salvador hits a baseball at a height of 3 ft and with an initial upward velocit of 88 feet per second. Step 1 Let represent time in seconds after the ball is hit, and let represent the height of the ball in feet. Write an equation that gives the height as a function of time. Step 2 Write an equation to find the times when the ball is 24 ft above the ground. Step 3 Rewrite our equation from Step 2 in the form a 2 b c 0, then use the quadratic formula to solve. What is the real-world meaning of each of our solutions? Wh are there two solutions? Step 4 Find the -coordinate of the verte of this parabola. How man different -values correspond to this -value? Eplain. 130 LESSON 7.4 Discovering Advanced Algebra Investigation Worksheets

17 Investigation How High Can You Go? (continued) Step 5 Write an equation to find the time when the ball reaches its maimum height. Use the quadratic formula to solve the equation. At what point in the solution process does it become obvious that there is onl one solution to this equation? Step 6 Write an equation to find the time when the ball reaches a height of 200 ft. What happens when ou tr to solve this impossible situation with the quadratic formula? Discovering Advanced Algebra Investigation Worksheets LESSON

18 Investigation Comple Arithmetic Name Period Date When computing with comple numbers, there are conventional rules similar to those ou use when working with real numbers. In this investigation ou will discover these rules. You ma use our calculator to check our work or to eplore other eamples. [ See Calculator Note 7E to learn how to enter comple numbers into our calculator. ] Part 1: Addition and Subtraction Addition and subtraction of comple numbers is similar to combining like terms. Use our calculator to add these comple numbers. Make a conjecture about how to add comple numbers without a calculator. a. (2 4i) (3 5i) b. (7 2i) ( 2 i) c. (2 4i) (3 5i) d. (4 4i) (1 3i) Part 2: Multiplication Use our knowledge of multipling binomials to multipl these comple numbers. Epress our products in the form a bi. Recall that i 2 1. a. (2 4i)(3 5i) b. (7 2i)( 2 i) c. (2 4i) 2 d. (4 4i)(1 3i) 132 LESSON 7.5 Discovering Advanced Algebra Investigation Worksheets

19 Investigation Comple Arithmetic (continued) Part 3: The Comple Conjugates Recall that ever comple number a bi has a comple conjugate, a bi. Comple conjugates have some special properties and uses. Each epression below shows either the sum or product of a comple number and its conjugate. Simplif these epressions into the form a bi, and generalize what happens. a. (2 4i) (2 4i) b. (7 2i) (7 2i) c. (2 4i)(2 4i) d. ( 4 4i)( 4 4i) Part 4: Division Recall that ou can create equivalent fractions b multipling the numerator and denominator of a fraction b the same quantit. For eample, 3_ 4 _ 3 _ 4 k 3k k 4k, and In the second case, multipling 3 the fraction b 2 2 produced an equivalent fraction with an integer 2 denominator instead of an irrational denominator. You will use a similar technique to change the comple number in each denominator into a real number. Use our work from Part 3 to find a method for changing each denominator into a real number. (Your method should produce an equivalent fraction.) Once ou have a real number in the denominator, divide to get an answer in the form a bi. a. 7 2i b i c. 2 i d. 2 4i 1 i 4 6i 8 6i 2 4i Discovering Advanced Algebra Investigation Worksheets LESSON

20 Investigation The Bo Factor Name Period Date You will need: the worksheet 16-b-20 Grid Paper, scissors, tape (optional) What are the different was to construct an open-top bo from a 16-b-20 unit sheet of material? What is the maimum volume this bo can have? What is the minimum volume? Your group will investigate this problem b constructing open-top boes using several possible integer values for. Step 1 Follow the Procedure Note to construct several differentsize boes from 16-b-20 unit sheets of paper. Record the dimensions of each bo and calculate its volume. Use the table to record the -values and volumes of the boes. Length Width Height Volume Cut the 16-b-20 unit rectangles out of the 16-b- 20 Grid Paper worksheet. 2. Choose several different values for. 3. For each value of, construct a bo b cutting squares with side length from each corner and folding up the sides. 16 Step 2 For each bo, what are the length, width, and height, in terms of? Use these epressions to write a function that gives the volume of a bo as a function of. 134 LESSON 7.6 Discovering Advanced Algebra Investigation Worksheets

21 Investigation The Bo Factor (continued) Step 3 Graph our volume function from Step 2. Plot our data points on the same graph. How do the points relate to the function? Step 4 What is the degree of this function? Give some reasons to support our answer. Step 5 Locate the -intercepts of our graph. (There should be three.) Call these three values r 1, r 2, and r 3. Use these values to write the function in the form r 1 r 2 r 3. Step 6 Graph the function from Step 5 with our function from Step 2. What are the similarities and differences between the graphs? How can ou alter the function from Step 5 to make both functions equivalent? Discovering Advanced Algebra Investigation Worksheets LESSON

22 Investigation The Bo Factor (continued) Step 7 What happens if ou tr to make boes b using the values r 1, r 2, and r 3 as? What domain of -values makes sense in this contet? What -value maimizes the volume of the bo? 136 LESSON 7.6 Discovering Advanced Algebra Investigation Worksheets

23 Investigation The Largest Triangle Name Period Date A A Take a sheet of notebook paper and orient it so that the longest edge is closest to ou. Fold the upper-left corner so that it touches some point on the bottom edge. Find the area, A, of the triangle formed in the lower-left corner of the paper. What distance,, along the bottom edge of the paper produces the triangle with the greatest area? Work with our group to find a solution. You ma want to use strategies ou ve learned in several lessons in this chapter. Write a report that eplains our solution and our group s strateg for finding the largest triangle. Include an diagrams, tables, or graphs that ou used. You might use the sample table and grid provided here. Distance along bottom (base of triangle) (cm) Height of triangle (cm) Area (cm 2 ) Discovering Advanced Algebra Investigation Worksheets LESSON

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